Any Guesses on track time?

[73Runner4spd]

Headed up to the track for the first time Wednesday (lebanon or epping) not sure yet. Anyways just wondering what you guys think I might run, The set up is a 73 runner 4 speed with a stock bottom end 400, 284/484 cam, 3.55, mcleod clutch, Long tube hookers, Edelbrock dual plane intake, edelbrock 1407 750, closed chambered heads (915s). Suspension is stock, hopefully will be running on street slicks. Not expecting it to be a rocket ship at the track especially it being my first time bringing running a manual at a track. So any guesses on what the car is capable of running with a decent driver? also any input on launching a 4 speed with out spinning too much cause it bakes my 275 radial t/a's off (hoping the drag radials will reduce that. Would like to see what it will run now, then after I switch the Edelbrock for a holley 750 with mechanical secondaries, then finally with a new set of 3.91s before I rebuild my 383 block.

 

[Polara Pat]

Stock drive shaft and U-joints? I wouldn't launch too hard if I was you.

 

[73Runner4spd]

Stock drive shaft and U-joints? I wouldn't launch too hard if I was you.

If it breaks it breaks lol. I dont want it to but I'm more than half expecting it with my luck, thats why I'm gonna trailer it! haha. No guess though?e

 

[Polara Pat]

That's really tough to guess without knowing more info on the car but I'll play. I would say high 13s if you can make traction and nail all you shifts.

 

[RustyRatRod]

Quicker than 15s and slower than 10s.

 

[67 coronet]

if its a good posi rear and the motor is not getting too old id say you will be in the 14.2 range or so.

 

[daredevil]

13.40

 

[Budnicks]

Probably at best Low to Mid to High 13's, depending on the actual weight of car {73 RR 4sd @ 3600lbs plus ??}, depending on weather/altitude conditions, depending whether you have the 3.91:1 gears & Drag radials installed & if it's properly tuned up for the conditions, the quality of launch/bite, no spinning the first 60-100ft, tires of type & drivers capabilities, especially with a 4spd, they aren't very consistent, for the novice at a race track & have a tendency to break things...... Maybe leave at around 2500-3000 rpm to start with & go from there.... Good Luck & Happy Moparing, have fun....

 

[67 B-body]

Mid 14's........... Maybe even low 15's...

 

[alleyoopmgv]

I say low to mid 14's

 

[73Runner4spd]

Haha thanks guys, you seem pretty optimistic. I can assure you my times will be all over the place due to my clutch packs separated -___-. Whole idea for the 3.91s is to have a quicker 60 ft time and to have my posi back full time lol! now its about half and half. Ill let you guys know, although I have a feeling I'm going to be a little embarrassed.

 

[daredevil]

Let the tires down to 20 lbs or so. If it hooks it will do great.

 

[383man]

My guess would be high 13's at best. With a car that heavy and only 3.55's I would not launch it real hard. I mean I used to put my gas pedal on the floor and dump the clutch when I had a 340 Dart with 4.88's. I would bring it up to around 1500 rpm's as the lights come down and then let the clutch out easy and lay into it but not real fast. Depending on your tires will tell how high of an rpm you will want to launch at. But if you have a sticky tire and come out about 5000 something may break. Good luck , Ron

 

[73Runner4spd]

My guess would be high 13's at best. With a car that heavy and only 3.55's I would not launch it real hard. I mean I used to put my gas pedal on the floor and dump the clutch when I had a 340 Dart with 4.88's. I would bring it up to around 1500 rpm's as the lights come down and then let the clutch easy and lay into it but not real fast. Depending on your tires will tell how high of an rpm you will want to launch at. But if you have a sticky tire and come out about 5000 something may break. Good luck , Ron

Looks like im borrowing pops drag radials for the day, unsure of the size at the moment but ill find out. Should I stick the the 2500 to 3000 launch? Anyone chime in on swapping the carb. Or do you guys prefer edelbrock?

 

[Budnicks]

Looks like im borrowing pops drag radials for the day, unsure of the size at the moment but ill find out. Should I stick the the 2500 to 3000 launch? Anyone chime in on swapping the carb. Or do you guys prefer edelbrock?

Run the Holley IMHO, I've never been a big fan of Edelbrock Carbs unless dual carbs configurations, Opinions will vary vastly I'm sure !!, with drag radials you don't want to bog it down too bad, or you will pretty much defeat the purpose of have drag radials in the 1st place, you will need to experiment on launch RPM's, like I said earlier, start at the 2500rpm range & work from there, allot will depend on how well it is tuned & hopefully you don't spit the drive-shaft out of it.... Drag radials & the 3.91:1 gears will help it 60ft times much better, than street tires & 3.55:1 gears, allot of your ET will be made or lost in the 1st 330ft. & especially the 1st 120ft, Good Luck........

 

[73Runner4spd]

Ouch haha that track day bruised my self esteem a little. I figured I wouldn't spin the drag radials too much, whoops my first pass I spun through first gear and part of second leaving at 3 grand, bumped it down to 2 grand and still spun through first. I don't know how bad that hurt my actual time, but my 60 foot times were 2.9 and 3.1 lmao

 

[robinsonwr]

Ouch haha that track day bruised my self esteem a little. I figured I wouldn't spin the drag radials too much, whoops my first pass I spun through first gear and part of second leaving at 3 grand, bumped it down to 2 grand and still spun through first. I don't know how bad that hurt my actual time, but my 60 foot times were 2.9 and 3.1 lmao

Wow, with those short times it sounds like you either need to baby out the hole or shock the tires harder. Tire pressure on drag radials is a critical issue. Also, burnout procedure on drag radials is different than other drag tires. If to long in burnout the tire gets slick and will not stick effectively. A short burnout is best with around 20lbs of air pressure. I feel mid 13's should be obtainable and with suspension tuning possibly low 13's with right conditions.

 

[73Runner4spd]

Wow, with those short times it sounds like you either need to baby out the hole or shock the tires harder. Tire pressure on drag radials is a critical issue. Also, burnout procedure on drag radials is different than other drag tires. If to long in burnout the tire gets slick and will not stick effectively. A short burnout is best with around 20lbs of air pressure. I feel mid 13's should be obtainable and with suspension tuning possibly low 13's with right conditions.

We'll see next week, I think I caught the drag racing bug. I was wicked rushed due to work (ended up getting to the track 2 hours late) only able to make two passes, I just checked my pressure, I'm at 27. I figured Next time ill drop it to 15 - 20 and drive around on it to warm them up a bit before the burnout. I ended up running a 16.301 haha so slow. But I trapped at 91 mph. I'm not too sure how many mph I lost from the 2.9 and 3.1 60 foot mark but I'm sure it was a few. Everyone I've talked to says if I can get it to hook high 13s low 14s shouldn't be tough.

60 foot 2.977
330 - 7.392
660 - 10.851
mph 1 - 70.72
1000 - 13.826
1320 - 16.301
mph 2 91.50

Pretty embarrassing if you ask me haha

 

[super-bee_ski]

I'll bet 15.2

 

[robinsonwr]

We'll see next week, I think I caught the drag racing bug. I was wicked rushed due to work (ended up getting to the track 2 hours late) only able to make two passes, I just checked my pressure, I'm at 27. I figured Next time ill drop it to 15 - 20 and drive around on it to warm them up a bit before the burnout. I ended up running a 16.301 haha so slow. But I trapped at 91 mph. I'm not too sure how many mph I lost from the 2.9 and 3.1 60 foot mark but I'm sure it was a few. Everyone I've talked to says if I can get it to hook high 13s low 14s shouldn't be tough.

60 foot 2.977
330 - 7.392
660 - 10.851
mph 1 - 70.72
1000 - 13.826
1320 - 16.301
mph 2 91.50

Pretty embarrassing if you ask me haha

I would definately lower the pressure and check pressure as soon as you pit. The 60ft times are definately a problem. Think about it this way though just about tenth at the small end equals two tenths on the big end. Your car should get some 1.8 sixty foot times with drag radials when gets hooked. When the math is done it should be around 13.80-14.00. Just by hooking the car up and getting a good 60. Without the pedaling, bogging, and smoking the tires the MPH should come around 100. Good luck and know that a lot of room for improvement is there.